Tube or pebble mill.



(No Model.)

tlnrrnn Starts FFICE@ CHARLES L. CARMAN, OF CHICAGO, ILLINOIS, ASSIGNORTO THE GATES IRON WORKS, OF SAME PLACE.

TUBE OR PEBBLE MILL.

SPECIFICATION forming part of Letters Patent lvm-643,220, dated February13, 1900.

y Application filed February 20, 1899. Serial No. 706,183. (No model.)

To ctZZ whom it may concern:

Be it known that I, CHARLES L. CARMAN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Tube or Pebble Mills, ofwhich the following is a specification.

My invention relates to that class of mills which are called tube orpebble mills, in which there is a rotatable barrel adapted to l holdmaterial to be crushed and adapted during its rotation by the use ofballs or pebbles to pulverize any material which may be containedtherein.

The principal object of my invention is to provide a simple, economical,and efficient tube or pebble mill.

- pressions, and means for removably holding such sections in position.

The invention consists, further, in the combination of a rotatablebarrel, a lining for the same composed of a plurality of removablesections arranged longitudinally with the barrel to form alternateelevations and depressions and provided with beveled lateral abuttingedges, and means for removably holding such sections in position.

The invention consists, further and finally, in the features,combinations, and details of construction hereinafter described andclaimed.

In the accompanying drawings, Figure l is a longitudinal elevation of aportion of a mill constructed in accordance with my improvements, partlyin section, and showing the means for driving the same; Fig. 2, an en-In the art to which this invention relates it is well known that thepower required to drive this class of mills is proportionate to thespeed of rotation, and therefore that it is desirable to rotate thetubular portion of these mills as slowly as possible in order to moreeconomically accomplish the operation of grinding or crushing, and,further, that to accomplish this result efficiently by slow rotations ofthe tubular portion it is desirable to provide a lining for the barrelwhich will prevent the material from slipping down on the concavesurface of the barrel. It is further well known that the cylinder shouldbe lined to prevent its wearing out, and that this lining should, ifpossible, be made so as to obtain the longest life of the'parts with thebest possible results in grinding. The principal ob ject of my inventiontherefore is to provide a tube or pebble mill of such construction andarrangement that the tendency to slip is minimized and a lining providedwhich will give the maximum length of service.

In constructing a mill in accordance with my improvements I make arotatable tubular portion A of the desired size, shape, and strength toaccomplish the desired results. In order to provideY a lining for thisbarrel which can be removed at pleasure for the purpose of renewal orrepair and at the same time prevent the tendency of the material to slipduring the rotations of the tube, I make a 1iningcomposed of a pluralityof removable sections B and B', which, as shown in Fig. 2 of thedrawings, form alternate thick and thin sections. From an inspection ofthe drawings it will be seen that these sections are arrangedlongitudinally with the barrel, alternating in thick and thin sections,the thick sections being preferably the narrowest and having convex upper surfaces, while the thin sections are the widest and have concavesurfaces. Each of these sections is provided with beveled lateral edgesb, abutting against the beveled and lateral edges of the adjacentsection in such manner that the thick sections act as wedges and serveto lock all of the sections togetherand to the tubular portion. In orderto hold these thick sections removably in engagement with the tubularportion, and thus secure all the parts together, I provide IOO them Withcountersunk holes or perforations plurality of alternate thick and thinsections b and provideva series of stove'bolts andnuts b2, which arepassed through such counter perforations in the sections and the tube insuch manner that the bolts can be tightened or loosened from the outsideof the barrel, thus facilitating the removal or insertion of thesectional lining whenever desirable or necessary.

In Fig. 1 I have shown a train of gears C, D, E, and G for driving orrotating the barrel, which is mounted on a pillow block or blocks H on afoundation I, though this part as Well as the other undescribed partsform no material feature of the invention and are merely illustrated anddescribed for the purpose of showing one method of driving the rotatablebarrel.

I claiml. In a machine of the class described, the combination of arotatable tubular portion, a lining for the same composed of a pluralityof removable sections arranged longitudinally with the barrel to formalternate elevations and depressions and provided With beveled lateralabutting edges, and means for removably holding such sections inposition, substantially as described.

2. In a machine of the class described, the combination of a rotatabletubular portion, a removable lining for the saine com posed of a withabutting beveled lateral edges arranged longitudinally With the barrelto form alternate elevations and depressions, and means for removablyholding each alternate section in position, substantially as described.

3. In a machine of the class described, the combination of a rotatabletubular portion, a removable lining for the same composed of apluralityof alternately thick and thin narrow and Wide sections Withabutting beveled edges arranged longitudinally With the barrel to formalternate elevations and depressions, and means for removably holdingsuch sections in position, substantially as described.

4. In a machine of the class described, the combination of a rotatabletubular portion, a removable lining .for the same composed of aplurality ot' alternately thick sections having convex upper surfacesand thin sections having concave upper surfaces, each sectionhavingbeveled abutting lateral edges arranged longitudinally With the barrelto form. alternate elevations and depressions, and bolt-and- 'nutmechanism for holding the thick sections and thereby all the sections inposition, substantially as described.

CHARLES L. GARMAN. lV itnesses:

THOMAS F. SHERIDAN, THOMAS B. McGREooR.

